diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -13,9 +13,15 @@
 
 ```haskell
 {-# LANGUAGE ExtendedDefaultRules #-}
-import Matplotlib
 
-onscreen $ contourF (\a b -> sin (degreesRadians a) + cos (degreesRadians b)) (-100) 100 (-200) 200 10
+import Graphics.Matplotlib
+
+degreesRadians a = a * pi / 180.0
+
+main :: IO ()
+main = do
+  Right _ <- onscreen $ contourF (\a b -> sin (degreesRadians a) + cos (degreesRadians b)) (-100) 100 (-200) 200 10
+  return ()
 ```
 
 We need `-XExtendedDefaultRules` to avoid having to manually having to specify certain types.
diff --git a/matplotlib.cabal b/matplotlib.cabal
--- a/matplotlib.cabal
+++ b/matplotlib.cabal
@@ -1,5 +1,5 @@
 name:                matplotlib
-version:             0.4.3
+version:             0.4.4
 synopsis:            Bindings to Matplotlib; a Python plotting library
 description:
     Matplotlib is probably the most full featured plotting library out there.
@@ -30,6 +30,8 @@
                      , aeson
                      , temporary
                      , containers
+                     , split
+                     , filepath
   default-language:    Haskell2010
 
 test-suite matplotlib-test
diff --git a/src/Graphics/Matplotlib.hs b/src/Graphics/Matplotlib.hs
--- a/src/Graphics/Matplotlib.hs
+++ b/src/Graphics/Matplotlib.hs
@@ -70,16 +70,17 @@
 import Data.List
 import Data.Aeson
 import Graphics.Matplotlib.Internal
+import Control.Concurrent(forkIO)
 
 -- * Running a plot
 
 -- | Show a plot, blocks until the figure is closed
-onscreen :: Matplotlib -> IO (Either String String)
-onscreen m = withMplot m (\s -> python $ pyIncludes "" ++ s ++ pyDetach ++ pyOnscreen)
+onscreen :: Matplotlib -> IO ()
+onscreen m = (forkIO $ (withMplot m (\s -> python $ pyIncludes "" ++ s ++ pyOnscreen) >> return ())) >> return ()
 
 -- | Print the python code that would be executed
 code :: Matplotlib -> IO String
-code m = withMplot m (\s -> return $ unlines $ pyIncludes (pyBackend "agg") ++ s ++ pyDetach ++ pyOnscreen)
+code m = withMplot m (\s -> return $ unlines $ pyIncludes (pyBackend "agg") ++ s ++ pyOnscreen)
 
 -- | Save to a file
 file :: [Char] -> Matplotlib -> IO (Either String String)
diff --git a/src/Graphics/Matplotlib/Internal.hs b/src/Graphics/Matplotlib/Internal.hs
--- a/src/Graphics/Matplotlib/Internal.hs
+++ b/src/Graphics/Matplotlib/Internal.hs
@@ -64,7 +64,7 @@
 
 -- | The io action is given a list of python commands to execute (note that
 -- these are commands in the sense of lines of python code; each inidivudal line
--- may not be parseable on its own
+-- may not be parseable on its own)
 withMplot :: Matplotlib -> ([String] -> IO a) -> IO a
 withMplot m f = preload cs []
   where
@@ -303,7 +303,7 @@
          (\codeFile codeHandle -> do
              forM_ codeStr (hPutStrLn codeHandle)
              hClose codeHandle
-             Right <$> readProcess "/usr/bin/env" ["python3", codeFile] ""))
+             Right <$> readProcess "env" ["python3", codeFile] ""))
          (\e -> return $ Left $ show (e :: IOException))
 
 pyBackend backend = "matplotlib.use('" ++ backend ++ "')"